const refreshToken = async (refreshTokenValue) => {
  try {
    const response = await fetch('https://api.weir.ai/auth/refresh/token', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({ refreshToken: refreshTokenValue })
    });
    
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }
    
    const data = await response.json();
    
    // Update stored tokens
    localStorage.setItem('accessToken', data.data.accessToken);
    localStorage.setItem('refreshToken', data.data.refreshToken);
    
    return data;
  } catch (error) {
    console.error('Token refresh error:', error);
    throw error;
  }
};

// Usage
const newTokens = await refreshToken('refresh_token_123456789');
console.log('New access token:', newTokens.data.accessToken);

import requests

def refresh_token(refresh_token_value):
    try:
        response = requests.post(
            'https://api.weir.ai/auth/refresh/token',
            json={'refreshToken': refresh_token_value}
        )
        response.raise_for_status()
        
        data = response.json()
        
        # Update stored tokens
        access_token = data['data']['accessToken']
        new_refresh_token = data['data']['refreshToken']
        
        return data
    except requests.exceptions.RequestException as e:
        print(f'Token refresh error: {e}')
        raise

# Usage
new_tokens = refresh_token('refresh_token_123456789')
print(f'New access token: {new_tokens["data"]["accessToken"]}')

function refreshToken($refreshTokenValue) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'https://api.weir.ai/auth/refresh/token');
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode([
        'refreshToken' => $refreshTokenValue
    ]));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    
    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    
    if ($httpCode !== 200) {
        throw new Exception("HTTP error: $httpCode");
    }
    
    $data = json_decode($response, true);
    
    // Update stored tokens
    $_SESSION['accessToken'] = $data['data']['accessToken'];
    $_SESSION['refreshToken'] = $data['data']['refreshToken'];
    
    return $data;
}

// Usage
$newTokens = refreshToken('refresh_token_123456789');
echo "New access token: " . $newTokens['data']['accessToken'];